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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets $ 628.2 $ 557.5 $ 521.3
Pension [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 12.4 159.1  
Pension [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 557.1 332.2  
Pension [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 58.7 66.2  
Pension [Member] | U.S. Large-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 108.6 [1] 94.6 [2]  
Pension [Member] | U.S. Large-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 94.6 [2]  
Pension [Member] | U.S. Large-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 108.6 [1] 0.0 [2]  
Pension [Member] | U.S. Large-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 51.9 [1] 44.8 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 51.9 [1] 44.8 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Small-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 51.5 [1] 45.0 [2]  
Pension [Member] | U.S. Small-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Small-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 51.5 [1] 45.0 [2]  
Pension [Member] | U.S. Small-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | International [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 122.3 89.0  
Pension [Member] | International [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 46.7  
Pension [Member] | International [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 122.3 42.3  
Pension [Member] | International [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Fixed Income [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 222.8 200.1  
Pension [Member] | Fixed Income [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Fixed Income [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 222.8 200.1  
Pension [Member] | Fixed Income [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Cash and Cash Equivalents [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 12.4 17.8  
Pension [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 12.4 17.8  
Pension [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Private Equity Funds [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 33.2 40.6  
Pension [Member] | Private Equity Funds [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Private Equity Funds [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Private Equity Funds [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 33.2 40.6  
Pension [Member] | Real Estate [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 25.5 25.6  
Pension [Member] | Real Estate [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Real Estate [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Real Estate [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 25.5 25.6  
Postretirement Health and Life [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 171.0 154.3 $ 153.4
Postretirement Health and Life [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 158.3 140.2  
Postretirement Health and Life [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 4.5 4.6  
Postretirement Health and Life [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 8.2 9.5  
Postretirement Health and Life [Member] | U.S. Large-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 32.1 [3] 27.9 [4]  
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 32.1 [3] 27.9 [4]  
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 24.3 [3] 20.7 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 24.3 [3] 20.7 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 15.5 [3] 14.0 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 15.5 [3] 14.0 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | International [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 35.8 [3] 27.9 [4]  
Postretirement Health and Life [Member] | International [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 35.8 [3] 27.9 [4]  
Postretirement Health and Life [Member] | International [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | International [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | Mutual Funds [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 49.8 48.6  
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 49.8 48.6  
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Fixed Income [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 4.5 4.6  
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 4.5 4.6  
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.8 1.1  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.8 1.1  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Private Equity Funds [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 8.2 9.5  
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets $ 8.2 $ 9.5  
[1] The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity securities large‑cap, mid-cap and small-cap indexes. Recurring Fair Value Measures Activity in Level 3Private Equity Funds Real EstateMillions Balance as of December 31, 2016$40.6$25.6Actual Return on Plan Assets7.11.7Purchases, Sales, and Settlements – Net(14.5)(1.8)Balance as of December 31, 2017$33.2$25.5
[2] The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1), mutual funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, to achieve the returns of the U.S. Equity Securities Mid-cap Growth and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments. Recurring Fair Value Measures Activity in Level 3 Private Equity Funds Real EstateMillions Balance as of December 31, 2015 $43.3$28.9Actual Return on Plan Assets 5.02.3Purchases, Sales, and Settlements – Net (7.7)(5.6)Balance as of December 31, 2016 $40.6$25.6
[3] The underlying investments consist of mutual funds (Level 1).
[4] The underlying investments consist of mutual funds (Level 1).